G-force sensor - only one axis?

Just got my OP-1 about a week ago, but have noticed that the g-force sensor is now only responding when I tilt the front of the unit up/away. Previously, it would respond when tilting the back up/forward, and also when raising either end of the unit. I’ve used cwo & phone to test since both have numeric values that aid in monitoring response. I’ve run all on-board diagnositcs & done a factory re-set, with no change. Any suggestions much appreciated.